diff --git a/src/fetcher.js b/src/fetcher.js
index 4782c2f..8b2b858 100644
--- a/src/fetcher.js
+++ b/src/fetcher.js
@@ -120,10 +120,13 @@ const createPost = async (args) => {
   return rows[0];
 };
 
-// TODO: TASK 3. crateComment
-const createComment = async () => {
-  console.log('createComment');
-  return {};
+const createComment = async (args) => {
+  const { content, author, post } = get(args, 'input', {});
+  const { rows } = await db.query({
+    text: 'INSERT INTO comments(id, content, author, post, timestamp) VALUES($1, $2, $3, $4, $5) RETURNING *',
+    values: [uuid(), content, author, post, new Date()],
+  });
+  return rows[0];
 };
 
 
diff --git a/src/schema.js b/src/schema.js
index c65e7e8..b1b0689 100644
--- a/src/schema.js
+++ b/src/schema.js
@@ -23,7 +23,7 @@ const {
   PostFieldFilter, PostFieldOrder, Post, PostConnection, PostMutations,
 } = require('./schema/post');
 const {
-  CommentFieldFilter, CommentFieldOrder, Comment, CommentConnection,
+  CommentFieldFilter, CommentFieldOrder, Comment, CommentConnection, CommentMutations,
 } = require('./schema/comment');
 
 const queryType = new GraphQLObjectType({
@@ -94,7 +94,10 @@ const mutationType = new GraphQLObjectType({
       type: PostMutations,
       resolve: () => PostMutations,
     },
-    // TODO: TASK 3. createComment mutation
+    comment: {
+      type: CommentMutations,
+      resolve: () => CommentMutations,
+    },
   },
 });
 
diff --git a/src/schema/comment.js b/src/schema/comment.js
index dac3f3b..4484edd 100644
--- a/src/schema/comment.js
+++ b/src/schema/comment.js
@@ -5,10 +5,11 @@ const {
   GraphQLEnumType,
   GraphQLList,
   GraphQLInputObjectType,
+  GraphQLNonNull,
 } = require('graphql');
 const { get } = require('lodash');
 
-const { resolveQuery } = require('../fetcher');
+const { resolveQuery, createComment } = require('../fetcher');
 const {
   Node, PageInfo, FilterOperation, OrderDirection, Datetime,
 } = require('./common');
@@ -91,8 +92,27 @@ const CommentConnection = new GraphQLObjectType({
   },
 });
 
-// TODO: TASK 3. CommentMutations and CreateCommentInput
-const CommentMutations = {};
+const CreateCommentInput = new GraphQLInputObjectType({
+  name: 'CreateCommentInput',
+  fields: {
+    content: { type: new GraphQLNonNull(GraphQLString) },
+    author: { type: new GraphQLNonNull(GraphQLString) },
+    post: { type: new GraphQLNonNull(GraphQLID) },
+  },
+});
+
+const CommentMutations = new GraphQLObjectType({
+  name: 'CommentMutations',
+  fields: {
+    createComment: {
+      type: Comment,
+      args: {
+        input: { type: CreateCommentInput },
+      },
+      resolve: (_, args) => createComment(args),
+    },
+  },
+});
 
 module.exports = {
   CommentArgField,